Your D-matrix is zero, so there is no direct throughput from input to output, i.e. any non-zero output has to come from the states of the system.

>Can anyone here explain me what are the reasons that the>output of the following system is always zero?>>A = [-0.2,0.0,0.0;0.0,-0.3,0.0;0.0,0.0,-0.7];>B = [0.0;0.0;2.5];>C = [0.0,2.6,0.0];>D = [0.0];

<snip>

Your input-matrix B only has a non-zero element on Row 3, i.e. the input only directly affects the third state. The state matrix A is diagonal, so that the three states do not affect each other.

Your output matrix C only has a non-zero element in the second column, i.e. the output is only affected by the second state. However, since A is diagonal and B is only non-zero in its third row, the second state is not affected by the third state or the input, i.e. it always stays zero. Thus, the output also always stays zero.

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